74 results about "Poly-para-phenylene" patented technology

Cadmium selenide, and other quantum dot materials, can be integrated into thin films of poly(para-phenylene vinylene) (PPV) or other polymer compounds without aggregation of the nanocrystals. Solid-state photoluminescence spectra of composite materials prepared by these novel techniques reveal the effect of this greatly enhanced quantum dot-polymer interface relative to cases where the nanoparticles are aggregated, such that electronic communication and energy transfer between the nanoparticle and polymer components is made more efficient.

The invention discloses a brake pad made of a composite material. The brake pad comprises a steel sheet and a friction block, and the friction block is prepared from boron-modified phenolic resin, organic silicone-modified phenolic resin, barium phenolic resin, phenylacetylene phenolic resin, epoxy-terminated liquid reaction type nitrile rubber, butadiene rubber, molybdenum disulfide, sisal fiber, bamboo carbon fiber, aluminum fiber, molybdenum fiber, poly-p-phenylene benzodioxazole fiber, zinc oxide crystal whiskers, montmorillonite, vermiculite, nanometer aluminum oxide, cerium oxide, zirconium boride, aluminum silicate hollow spheres, graphene oxide, copper powder, carbon nano tubes, nano carbon black, butadiene styrene rubber powder, ammonium molybdate and octaphenyl silsesquioxane. The brake pad made of the composite material is high in high temperature resistance, excellent in heat stability, high in abrasion resistance and long in service life.

The invention provides a silicone rubber-based heat-insulating coating and a preparation method thereof. The silicone rubber-based heat-insulating coating comprises heat-insulating coating, radiationcoating and ablation coating, wherein the heat-insulating coating is arranged on the surface of a substrate; the radiation coating is arranged between the heat-insulating coating and the ablation coating; the heat-insulating coating, the radiation coating and the ablation coating are silicone rubber-based coating; the radiation coating performing an in-situ ceramization reaction through heat penetrating through the ablation coating; poly-p-phenylene benzobisoxazole fiber is distributed in the ablation coating. The preparation method comprises the steps of preparing the ablation coating, the radiation coating and the heat-insulating coating. Compared with the prior art, the silicone rubber-based heat-insulating coating has the beneficial effects as follows: through use of the poly-p-phenylene benzobisoxazole fiber, the mechanical properties of the ablation coating are improved; through the in-situ ceramization reaction, the high-radiation coating is prepared, and the defects of low mechanical properties and heat-insulating performance of the silicone rubber-based heat-insulating coating are successfully overcome; the silicone rubber-based heat-insulating coating has a wide application prospect in the field of heat protection of structural surfaces of rocket-carrying and missile weapons and the like.

Organic light emitting diode (OLED) devices are one of the most promising alternatives to liquid crystal displays (LCDs) for flat panel display (FPD) applications. The OLED technique is based on organic semiconductors used either as hole- or electron transporting materials or as an emitter. Working on common problems of performance and life time in OLED preparation, improved charge transport molecules and polymers such as triarylamine- and poly(para-phenylene)-have been developed. Some useful materials include: (1) cyclic triarylamine-derivatives possessing enhanced glass transition temperatures; (2) triarylamine based low molecular mass hole-transport molecules and hole-transport polymers with pendant oxetane groups for processing out of solution and subsequent cross-linking; and (3) fluorenyl-segmented poly(para-phenylene)s with defined electrochemical properties. Provided is a polymer precursor that is useful as a hole transport polymer in OLED and other organic electronic devices.

The invention relates to a method for depolymerizing and recovering high temperature resistant nylon poly(p-phenylene-hexamethylenediamine), which is characterized by comprising the following steps in turn: sodium hydroxide and water are added into a reaction kettle, dissolved, added with crushed nylon PA5T, and subjected to depolymerizaton to obtain a alkali-hydrolyzable liquid; the alkali-hydrolyzable liquid passes through a filter, enters a workshop section of separation and extraction, and is extracted and separated by an arene/alcohol mixed extractant to obtain coarse hexamethylenediamine extract and terephthalic acid sodium salt faffinate; the coarse hexamethylenediamine extract is subjected to distillation and rectification to respectively obtain arene/alcohol/-hexamethylenediamine and arene/alcohol, an organic solvent which is distilled off is replenished with a fresh solvent and can be reused as an extractant, and refined hexamethylenediamine can be obtained after removal of a extracting solvent with low boiling point by means of distillation, and decompression and rectification; and the terephthalic acid sodium salt solution is subjected to decolorization, neutralization, filtration and separation to obtain a terephthalic acid, and a refined terephthalic acid is obtained after water scrubbing and drying of the terephthalic acid. The method has reasonable and practical technology, can reutilize the solvent, reduces the recovery cost, simultaneously reduces environmental pollution, and improves the resource utilization rate.

The invention discloses a manufacture method of organic pulp stage fiber with high performance and high temperature-resistant performance. The invention uses the bavella silk, spinning silk and other out materials, textiles, braiding leftover bits and pieces and wasting materials of high temperature-resistant and high performance organic fiber as raw materials, the high temperature-resistant and high performance organic fiber such as aramid fiber and PBO fiber. The raw materials are cut into the short fiber with the length of 2-10 mm, the fiber form the suspending liquid evenly with 0. 1-8 wt% using the dispersants, then the suspending liquid is pumped into high shearing equipments at the flow ratio of 2-10 t/h to grinding, and the pulp stage fiber is prepared (shortly aramid fiber pulp or PBO pulp, etc. ) The high temperature-resistant and high performance organic pulps can replace the asbestos in many fields of friction, sealing materials, papermaking and so on. The high temperature-resistant and high performance organic pulps in the manufacture method has higher fibrillating degree, better dispersity and more uniform structure, and the manufacture method has higher production efficiency.

The invention discloses a vehicle brake pad with a composite material. The vehicle brake pad comprises a steel sheet and a friction block; and the friction block includes raw materials of: boron modified phenolic resins, organic silicon modified phenolic resins, barium phenolic resins, phenylacetylene phenolic resins, terminal epoxy liquid reaction nitrile rubber, butadiene rubber, molybdenum disulfide, sisal fibers, carbon fibers, aluminum fibers, molybdenum fibers, polyphenylene benzodioxazole fibers, zinc oxide whiskers, montmorillonoid, vermiculite, nanometer aluminum oxide, cerium oxide, zirconium boride, aluminum silicate hollow spheres, oxidized graphene, copper powder, carbon nanotubes, nanometer carbon black, powder butadiene styrene rubber, ammonium molybdate, and octaphenyl silsesquioxane. The vehicle brake pad with the composite material is excellent in high-temperature resistance and heat resisting stability, high in wear resistance and long in service life.

The invention relates to a solvent recovery method for para-aramid fiber production, and belongs to the field of fine chemical engineering. The solvent recovery method includes the steps: firstly, adding calcium carbonate into PPTA (poly-para-phenylene terephthalamide) polymerized washing liquid to neutralize hydrochloric acid generated by polymerization; secondly, conveying the neutralized washing liquid to an extraction column for extraction separation; thirdly, conveying an extraction phase to a crude separation device for separating extraction agents and NMP (non-methane products) to obtain crude separation materials; fourthly, adding the crude separation materials into hot water, conveying the crude separation materials to a fine separation device for further separating the extractionagents to obtain fine separation materials; fifthly, conveying the fine separation materials into a purification evaporator for NMP purification and recovery; sixthly, performing ion substitution andsedimentation treatment on rectification waste liquid, filter-pressing deposits and then conveying filtrate again to the extraction column for extraction separation; seventhly, mixing, cooling and conveying the NMP and calcium chloride water solution to a polymerization system to prepare p-phenylenediamine solution. The method effectively solves the problems of rectification waste liquid treatment and extraction agent decomposition and acidification, NMP recovery rate and recovery quality are improved, and stable and continuous operation of solvent recovery production cannot be affected.

The invention relates to a fluorescence sensing material for Cu2+ and Fe3+ detection and a preparation method and application thereof. The preparation method includes dissolving polyphenylene vinylene precursor and polymethyl methacrylate into N, N-dimethyl-formamide solvent, obtaining polyphenylene vinylene precursor/polymethyl methacrylate nanofiber membrane after electrostatic spinning, and subjecting the obtained nanofiber membrane to a heat eliminating treatment under a vacuum state at the temperature of 110 to 130 DEG C to obtain the fluorescent sensing material. The fluorescent sensing material has a high specific surface area, so that the contact surface of the fluorescent sensing material and detection molecule can be effectively enlarged to obtain greatly improved detection sensitivity. The fluorescent sensing material has no specific receptor and has a special porous nanofiber structure formed by high temperature elimination to realize identification of the substance to be detected. When subjected to optical excitation, the fluorescent sensing material shows high selectivity and sensitivity to Cu2+ and Fe3+ and has different responsiveness. The fluorescent sensing material can be reused and has a good application prospect.

The invention discloses poly phenylenevinylene conjugated polymer fluorescent nanoparticles with a controllable emission wavelength and a preparation method. The method comprises the following steps of preparing PPV (Poly-Phenylene Vinylene) precursor solution according to a Wessling polymer sulfonium salt precursor method, taking methanol as a substitution reaction agent, replacing tetrahydrothiophene groups of the PPV precursor partly by methoxyl under the anaerobic and high temperature condition, after removing the methanol by vacuum distillation, eliminating residual tetrahydrothiophene groups of the PPV precursor selectively, converting the PPV precursor to PPV light emitting polymer; and obtaining PPV nanoparticles through self-assembly of polymer chains in the process of elimination simultaneously. According to the method provided by the invention, the reaction time of the PPV precursor and the methanol is controlled to obtain PPV nanoparticles with different emission wavelengths. The prepared PPV conjugated polymer fluorescent nanoparticles have the advantages of being narrow in particle size distribution, controllable in emission wavelength, simple in preparation technology, convenient in operation, and is suitable for industrial production.

The invention relates to a polyvinyl alcohol fluorescence fiber film, and a making method and an application thereof, and belongs to the technical field of fluorescent materials. The preparation method comprises the following steps: preparing an aqueous solution of a poly(p-phenylene vinylene) polymer precursor through a sulfonium salt precursor process, mixing the above precursor with polyvinyl alcohol in proportion to prepare a spinning liquid, and carrying out an electrostatic spinning process to obtain polyethelene alcohol fibers containing the precursor; and heating under vacuum conditions to obtain a poly(p-phenylene vinylene)-containing polyethelene alcohol fiber film, immersing the fiber film in an acetone solution of glutaraldehyde/HCl to obtain the polyvinyl alcohol fluorescence fiber film with the maximum emission wavelength of 476-487nm. If the polyvinyl alcohol fluorescence fiber film is immersed in non-polar aromatic hydrocarbons, the obvious quenching of the fluorescence of the fiber film will appear; and if the aromatic hydrocarbons are removed, the fluorescence is recovered, and the fiber film has extremely low response to general non-aromatic solvents. The fiber film made in the invention has a smooth surface and a stable fluorescence performance, and has the characteristics of excellent sensing responsiveness and repeatable utilization when the fiber film is used as a fluorescence sensing material.

The invention discloses a waterproof plasterboard. The waterproof plasterboard comprises, by weight, expanded vermiculite of 20.0 to 60.0 parts, expanded perlite of 12.0 to 30.0 parts, desulfurized gypsum powder of 100.0 to 300.0 parts, mixed fiber of 60.0 to 180.0 parts, organosiloxane of 40.0 to 60.0 parts, a stearate of 20.0 to 60.0 parts, a thickening agent of 10.0 to 30.0 parts, and water of2000.0 to 3000.0 parts. The waterproof plasterboard possesses following advantages: a hydrophobic film is formed on the plasterboard because of polymerization of silane, so that water resistance is achieved; adsorption of organosiloxane onto the stearate is adopted, on one hand, siloxane volatilization is prevented, and on the other hand, organosiloxane is uniformly dispersed in gypsum, the stearate is capable of promoting siloxane hydrolysis, the stearate possesses water resistance, and is capable of providing the finished product plasterboard with smoothness and flexibility. The waterproof plasterboard prepared using the above method possesses following advantages: the adding amount of a waterproof agent is low, cost is low, effect is excellent; and poly(p-phenylene benzobisoxazole) fiber is lower in density, and higher in specific strength and specific modulus than those of carbon fiber.

The invention provides a liquid crystal polymer film for a flexible printed circuit board. Materials of the liquid crystal polymer film comprise poly-p-phenylene dimethyl amide resin and polyphenylenesulfide resin, the longitudinal tensile strength of the liquid crystal polymer film is smaller than the transverse tensile strength, and the longitudinal elongation at break of the liquid crystal polymer film is larger than the transverse elongation at break of the liquid crystal polymer film. According to the invention, the isotropic liquid crystal polymer film is used as the material of a substrate of the flexible printed circuit board, so that the flexible printed circuit board has excellent dielectric properties and mechanical properties and meets the requirements in the field of high-frequency application.

The invention relates to a method for recycling a solvent during poly-para-phenylene terephthalamide reaction, and belongs to the technical field of synthesis of high-molecular materials. The poly-para-phenylene terephthalamide prepared through polycondensation at a low temperature is washed to obtain an NMP (N-Methylpyrrolidone) and calcium chloride water solution, and the NMP and calcium chloride water solution passes through a filtering system, a dewatering system, a coarse distillation system, a preparation system, a fine distillation system, and the like to obtain an NMP-calcium chloride solution with water ratio less than 150 ppm. The method disclosed by the invention reduces the operating temperature and enhances the solution purity by adding an auxiliary agent to the coarse distillation system, obtains an NMP-calcium chloride system capable of being recycled in a polymerization unit through the preparation system and solves the problem of recycling of calcium chloride.

The invention discloses a preparing method for modified oxidized graphene. The preparing method includes the steps that a poly-para-phenylene terephthalamide low polymer capped with amino groups is used as a modifier for carrying out surface modification on oxidized graphene, and hydrazine hydrate is used as a reductant for reducing the modified oxidized graphene to obtain the surface-functionalized graphene. The PPTA polymer capped with the amino groups is obtained through simple one-step polymerization and is directly grafted to the oxidized graphene to obtain the modified oxidized graphene, the modified oxidized graphene has good dispersity in organic solvent, and by means of the polar group and benzene ring structure on PPTA, the modified oxidized graphene has high compatibility with various polymers.

The invention belongs to the technical field of functional materials and discloses a soluble graphene nanoribbon as well as a synthetic method and an application thereof. The synthetic method comprises the steps that 2,6-dibromo-4-nitroaniline and alkyl/alkoxy arylboronic acid have a Suzuki coupling reaction, 2,6-bis(4-alkyl/alkoxy benzene)-4-nitroaniline is obtained and reduced, 2,6-bis(4-alkyl/alkoxy benzene)-1,4-phenylenediamine is obtained and has halogenation, 2,6-bis(4-alkyl/alkoxy benzene)-1,4-dibromo/iodobenzene is obtained and has an Miyaura borylation reaction, and 2,6-bis(4-alkyl/alkoxy benzene)-4-boronic acid pinacol ester-1-bromo/iodobenzene is obtained; then a poly-para-phenylene derivative is generated through the Suzuki coupling reaction, and a product is obtained through oxidative dehydrogenation. The soluble graphene nanoribbon can be applied to the fields of field effect transistors, photovoltaic cells, non-linear optics and sensing.